CN103580712A - Signal transceiver and adaptability impedance switching circuit - Google Patents
Signal transceiver and adaptability impedance switching circuit Download PDFInfo
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- CN103580712A CN103580712A CN201210271160.0A CN201210271160A CN103580712A CN 103580712 A CN103580712 A CN 103580712A CN 201210271160 A CN201210271160 A CN 201210271160A CN 103580712 A CN103580712 A CN 103580712A
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Abstract
The invention discloses a signal transceiver which comprises a connecting device used for receiving a signal, a band-pass filter connected with the connecting device in a coupled mode and used for filtering the signal, a front-end module used for demodulating the signal and an adaptability impedance switching circuit which is connected between the front-end module and the band-pass filter in a coupled mode and used for switching a resistance value between the band-pass filter and the front-end module.
Description
Technical field
The present invention means a kind of signal transceiver and adaptability impedance commutation circuit, espespecially a kind of can be under electric power closed condition, effectively improve signal transceiver and the adaptability impedance commutation circuit of echo consume (return loss).
Background technology
Coaxial cable Ethernet (Ethernet over Coax, EoC) be a kind of transmission technology of Ethernet signal on coaxial cable, its object is to utilize the infrastructure of existing cable TV to connect Internet or wideband transfer of data, compatible existing cable TV (or satellite television) broadcast singal, reaches the while in the object of same transmission over coaxial cable data-signal.Wherein, (the Multimedia over Coax Alliance of multimedia coaxial cable alliance, MoCA) high speed that multimedia network road etalon indefectible (glitch-free) streaming media formulated is required and high service quality (QoS) function etc., see through existing coaxial cable, signal is delivered to each user side, user side only need a signal transceiver just can restituted signal to obtain service content.
Please refer to Fig. 1, Fig. 1 is the schematic diagram of a known signal transceiver 10.Signal transceiver 10 includes a connector 100, a band pass filter (band-pass filter, BPF) 102 and one front-end module 104.Conventionally, signal transceiver 10 is with box on machine (set-top box, STB) Realization of Product.Connector 100 connects a coaxial cable, is used for receiving the signal that sees through coaxial cable transmission, includes the signal (hereinafter referred to as MoCA signal) that meets multimedia coaxial cable alliance.Band pass filter (band-pass filter, BPF) 102 is used for trap signal, to leach the signal in a frequency band range.For instance, U.S.'s satellite television service provider DIRECTV
tMthe frequency band range of the MoCA signal providing is between between 475MHz to 625MHz.If only need retain this MoCA signal, the filtered band scope of band pass filter 102 should be set as 475MHz to 625MHz.Front-end module 104 is in order to passing through the signal demodulation of band pass filter 102.Generally speaking, front-end module 104 includes the circuit such as transmission receiver, power amplifier and attenuator, and front-end module 104 is integrated in an integrated circuit (integrated circuit, IC) conventionally.
Please refer to Fig. 2 A and Fig. 2 B, Fig. 2 A and Fig. 2 B are respectively signal transceiver 10 under electric power opening and under electric power closed condition, and in the frequency band of 475MHz～625MHz, connect a coaxial cable (diagram is not drawn) of connector 100 and the schematic diagram of the echo consume between connector 100.Comparison diagram 2A and Fig. 2 B are known, in the frequency band of 475MHz～625MHz, the minimum echo consume of signal transceiver 10 under electric power closed condition approaches 7.6dB, is less than approximately 3.4dB of the minimum echo consume (approach 11dB) of signal transceiver 10 under electric power opening.From the above, if signal transceiver 10 operates under electric power closed condition, really can cause system effectiveness variation.
Summary of the invention
Therefore, main purpose of the present invention, is to provide a kind of signal transceiver and adaptability impedance commutation circuit, under electric power closed condition, can effectively increase echo consume.
The present invention discloses a kind of signal transceiver, includes a connector, is used for receiving a signal; One band pass filter, is coupled to this connector, is used for filtering this signal; One front-end module, is used for this signal of demodulation; And an adaptability impedance commutation circuit, be coupled between this band pass filter and this front-end module, be used for switching the resistance value between band pass filter and front-end module.
In addition, the present invention has also disclosed a kind of adaptability impedance commutation circuit, is used for switching a resistance value in a signal transceiver, and adaptability impedance commutation circuit includes: an input, is used for receiving a signal; One output, is used for exporting described signal; One voltage input circuit, is used to provide an input voltage; One frequency resonant circuit, is coupled to described input and described voltage input circuit, is used for adjusting described resistance value; And a bias circuit, be coupled between a node that described input, described voltage input circuit and described frequency resonant circuit connect and described output, be used for a magnitude of voltage of the signal described in conversion.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a known signal transceiver.
Fig. 2 A be the signal transceiver of Fig. 1 under electric power opening, and in a special frequency band, connect a coaxial cable of connector and the schematic diagram of the consume of the echo between connector.
Fig. 2 B be the signal transceiver of Fig. 1 under electric power closed condition, and in a special frequency band, connect a coaxial cable of connector and the schematic diagram of the consume of the echo between connector.
Fig. 3 is the schematic diagram of the embodiment of the present invention one signal transceiver.
Fig. 4 A is the schematic diagram of the adaptability impedance commutation circuit of Fig. 3.
Fig. 4 B be in the adaptability impedance commutation circuit of Fig. 3 when switch switches to conducting state the schematic diagram of the sense of current.
Fig. 4 C be in the adaptability impedance commutation circuit of Fig. 3 when switch switches to off state the schematic diagram of the sense of current.
Fig. 5 A be the signal transceiver of Fig. 3 under electric power opening, and in a special frequency band, the schematic diagram of the echo consume between band pass filter and front-end module.
Fig. 5 B be the signal transceiver of Fig. 3 under electric power closed condition, and in a special frequency band, the schematic diagram of the echo consume between band pass filter and front-end module.
Fig. 6 A be the signal transceiver of Fig. 3 under electric power opening, and in a special frequency band, connect a coaxial cable of connector and the schematic diagram of the consume of the echo between connector.
Fig. 6 B be the signal transceiver of Fig. 3 under electric power closed condition, and in a special frequency band, connect a coaxial cable of connector and the schematic diagram of the consume of the echo between connector.
Main element symbol description:
10,30 signal transceivers
100,300 connectors
102,302 band pass filters
104,306 front-end modules
304 adaptability impedance commutation circuits
400 inputs
402 outputs
404 voltage input circuits
406 frequency resonant circuits
408 bias circuits
410 voltage input ends
Vcc input voltage
SW switch
R1, R2, R3, R4 resistance
C1, C2, C3 electric capacity
L1 inductance
D1, D2, D3 switch
Embodiment
Please refer to Fig. 3, Fig. 3 is the schematic diagram of the embodiment of the present invention one signal transceiver 30.Signal transceiver 30 includes a connector 300, a band pass filter 302, an adaptability impedance commutation circuit 304 and a front-end module 306.Connector 300, band pass filter 302, front-end module 306 are identical with connector 100, band pass filter 102, the front-end module 104 of known signal transceiver 10 respectively, are not repeated herein.Adaptability impedance commutation circuit 304 is coupled to band pass filter 302 and front-end module 306, is used for switching the resistance value between band pass filter 302 and front-end module 306.
Execution mode about adaptability impedance commutation circuit 304, please refer to Fig. 4 A.Adaptability impedance commutation circuit 304 includes an input 400, an output 402, a voltage input circuit 404, a frequency resonant circuit 406 and a bias circuit 408.Input 400 is coupled to band pass filter 302, is used for receiving by the signal of band pass filter 302.Output 402 is coupled to front-end module 306, is used for exporting the signal by band pass filter 302 to front-end module 306.Voltage input circuit 404 is used to provide input voltage Vcc, and it includes voltage input end 410, switch SW and resistance R 1.Wherein, voltage input end 410 is used for receiving input voltage Vcc, and switch SW is used for the state of switched voltage input circuit 404, and resistance R 1 is coupled to switch SW.Frequency resonant circuit 406 is coupled to input 400 and voltage input circuit 404, is used for adjusting the resistance value between band pass filter 302 and front-end module 306.Frequency resonant circuit 406 includes resistance R 2, R3, capacitor C 1, C2, C3, inductance L 1 and switch D2, D3.Bias circuit 408 is coupled between the node and output 402 that input 400, voltage input circuit 404 and frequency resonant circuit 406 connect, and is used for the magnitude of voltage of switching signal.Bias circuit 408 includes resistance R 4 and switch D1.Above-mentioned switch D1, D2, D3 are better with diode, realizes, and the resistance value of resistance R 2 can determine according to an element that is connected to connector 300, for example, can be a coaxial cable.
Fig. 4 B and Fig. 4 C illustrate respectively when switch SW switches to conducting and off state, the sense of current of adaptability impedance commutation circuit 304.As shown in Figure 4 B, when switch SW switches to conducting state (being electric power opening), switch D1, D2, D3 are conducting state, therefore electric current has two directions (as shown in arrow), one is the switch D1 that flows through, and another is extremely held for the resistance R 2 of flowing through, switch D2, capacitor C 2, switch D3.Capacitor C 3 can be designed to use larger capacitance, and resistance R 3 can be designed to use larger resistance value, to avoid the situation of generation current adverse current.As shown in Figure 4 C, when switch SW switches to off state (being electric power closed condition), switch D1, D2, D3 are not on-state, therefore electric current is extremely held (as shown in arrow) along the direction of resistance R 2, inductance L 1, capacitor C 1, that is to say, the path that resistance R 2, inductance L 1 and capacitor C 1 form is short circuit (short circuit) state.
The adaptability impedance commutation circuit 304 of the embodiment of the present invention is an independent circuits, is coupled between band pass filter 302 and front-end module 306.Yet, it should be noted, adaptability impedance commutation circuit 304 separately can be integrated into an integrated circuit with front-end module 306.
Please refer to Fig. 5 A and Fig. 5 B, Fig. 5 A and Fig. 5 B are respectively signal transceiver 30 under electric power opening and under electric power closed condition, and in the frequency band of 475MHz～625MHz, the schematic diagram of the echo consume between band pass filter 302 and front-end module 306.Comparison diagram 5A and Fig. 5 B are known, in the frequency band of 475MHz～625MHz, the minimum echo consume of signal transceiver 30 under electric power closed condition approaches 20dB, is greater than approximately 9dB of the minimum echo consume (approach 11dB) of signal transceiver 30 under electric power opening.From the above, signal transceiver 30 operates under electric power closed condition, and the echo consume between band pass filter 302 and front-end module 306 will promote.
Please refer to Fig. 6 A and Fig. 6 B, Fig. 6 A and Fig. 6 B are respectively signal transceiver 30 under electric power opening and under electric power closed condition, and in the frequency band of 475MHz～625MHz, connect a coaxial cable (diagram is not drawn) of connector 300 and the schematic diagram of the echo consume between connector 300.Comparison diagram 6A and Fig. 6 B are known, in the frequency band of 475MHz～625MHz, the minimum echo consume of signal transceiver 30 under electric power closed condition approaches 11.5dB, is greater than approximately 0.5dB of the minimum echo consume (approach 11dB) of signal transceiver 30 under electric power opening.From the above, when signal transceiver 30 operates under electric power closed condition, the echo consume between band pass filter 302 and front-end module 306 can maintain on the minimum echo consume that operates in electric power opening.
It should be noted, above-mentioned Fig. 5 B and Fig. 6 B only illustrate in the frequency band of 475MHz～625MHz, and the minimum echo consume of signal transceiver 30 under electric power closed condition can effectively increase.Tool knows that the knowledgeable is when adjusting the characteristic of each element according to different frequency bands conventionally in the art, and the minimum echo consume within the scope of different frequency bands can effectively be increased.
Known signal transceiver is under electric power closed condition, and echo consume can reduce, and causes system effectiveness variation.In comparison, signal transceiver of the present invention sees through adaptability impedance commutation circuit, can under electric power closed condition, switch the impedance between band pass filter and front-end module, and then effectively improves echo consume.
In sum, signal transceiver of the present invention can effectively improve echo consume under electric power closed condition, and then elevator system usefulness.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the claims in the present invention scope change and modify, and all should belong to covering scope of the present invention.
Claims (13)
1. a signal transceiver, is characterized in that, described signal transceiver includes:
A connector, is used for receiving a signal;
One band pass filter, is coupled to described connector, is used for filtering described signal;
One front-end module, the signal being used for described in demodulation; And
One adaptability impedance commutation circuit, is coupled between described band pass filter and described front-end module, is used for switching the resistance value between described band pass filter and described front-end module.
2. signal transceiver as claimed in claim 1, is characterized in that, described adaptability impedance commutation circuit includes:
One input, is coupled to described band pass filter, is used for receiving described signal;
One output, is coupled to described front-end module, is used for exporting described signal to described front-end module;
One voltage input circuit, is used to provide an input voltage;
One frequency resonant circuit, is coupled to described input and described voltage input circuit, is used for adjusting described resistance value; And
One bias circuit, between the node that the input described in being coupled to, described voltage input circuit and described frequency resonant circuit connect and described front-end module, is used for changing a magnitude of voltage of described signal.
3. signal transceiver as claimed in claim 2, is characterized in that, described voltage input circuit includes:
One voltage input end, is used for receiving described input voltage;
One switch, is coupled to described voltage input end, is used for switching a state of described voltage input circuit; And
One first resistance, is coupled to described switch.
4. signal transceiver as claimed in claim 2, is characterized in that, described frequency resonant circuit includes:
One second resistance, its one end is coupled to described voltage input circuit and described input;
One inductance, its one end is coupled to the second described resistance;
One first electric capacity, its one end is coupled to described inductance;
One first switch, between the second resistance described in its one end is coupled to and described inductance;
One second electric capacity, its one end is coupled to the first described switch;
One second switch, its one end is coupled to the second described electric capacity; And
One the 3rd electric capacity, its one end is coupled between described inductance and described the first electric capacity, and its other end is coupled between the second described electric capacity and described second switch.
5. signal transceiver as claimed in claim 4, is characterized in that, described signal transceiver separately includes:
One the 3rd resistance, is parallel to the second described electric capacity.
6. signal transceiver as claimed in claim 4, is characterized in that, a resistance value system of the second described resistance determines according to an element that is connected in described connector.
7. signal transceiver as claimed in claim 2, is characterized in that, described bias circuit includes:
One the 3rd switch; And
One the 4th resistance, between the 3rd switch described in being coupled to and described output.
8. an adaptability impedance commutation circuit, is used for switching a resistance value in a signal transceiver, it is characterized in that, described adaptability impedance commutation circuit includes:
One input, is used for receiving a signal;
One output, is used for exporting described signal;
One voltage input circuit, is used to provide an input voltage;
One frequency resonant circuit, is coupled to described input and described voltage input circuit, is used for adjusting described resistance value; And
One bias circuit, between the node that the input described in being coupled to, described voltage input circuit and described frequency resonant circuit connect and described output, is used for changing a magnitude of voltage of described signal.
9. adaptability impedance commutation circuit as claimed in claim 8, is characterized in that, described voltage input circuit includes:
One voltage input end, is used for receiving described input voltage;
One switch, is coupled to described voltage input end, is used for switching a state of described voltage input circuit; And
One first resistance, is coupled to described switch.
10. adaptability impedance commutation circuit as claimed in claim 8, is characterized in that, described frequency resonant circuit includes:
One second resistance, its one end is coupled to described voltage input circuit and described input;
One inductance, its one end is coupled to the second described resistance;
One first electric capacity, its one end is coupled to described inductance;
One first switch, between the second resistance described in its one end is coupled to and described inductance;
One second electric capacity, its one end is coupled to the first described switch;
One second switch, its one end is coupled to the second described electric capacity; And
One the 3rd electric capacity, its one end is coupled between described inductance and described the first electric capacity, and its other end is coupled between the second described electric capacity and described second switch.
11. adaptability impedance commutation circuits as claimed in claim 10, is characterized in that, described adaptability impedance commutation circuit separately includes:
One the 3rd resistance, is parallel to the second described electric capacity.
12. adaptability impedance commutation circuits as claimed in claim 10, is characterized in that, a resistance value system of the second described resistance determines according to an element that is connected in described signal transceiver.
13. adaptability impedance commutation circuits as claimed in claim 8, is characterized in that, described bias circuit includes:
One the 3rd switch; And
One the 4th resistance, between the 3rd switch described in being coupled to and described output.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210271160.0A CN103580712B (en) | 2012-08-01 | 2012-08-01 | Signal transceiver and adaptability impedance switching circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210271160.0A CN103580712B (en) | 2012-08-01 | 2012-08-01 | Signal transceiver and adaptability impedance switching circuit |
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| CN103580712A true CN103580712A (en) | 2014-02-12 |
| CN103580712B CN103580712B (en) | 2015-07-15 |
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| CN201210271160.0A Active CN103580712B (en) | 2012-08-01 | 2012-08-01 | Signal transceiver and adaptability impedance switching circuit |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101308955A (en) * | 2008-05-22 | 2008-11-19 | 杭州中科微电子有限公司 | Radio frequency integrated GPS active antenna |
| CN101395808A (en) * | 2006-05-19 | 2009-03-25 | 株式会社村田制作所 | Matching device, and antenna matching circuit |
| US20110143685A1 (en) * | 2009-12-10 | 2011-06-16 | Haki Cebi | Multiband Low Noise Amplifier (LNA) With Parallel Resonant Feedback |
| WO2012064665A2 (en) * | 2010-11-08 | 2012-05-18 | Paratek Microwave, Inc. | Method and appartus for tuning antennas in a communication device |
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2012
- 2012-08-01 CN CN201210271160.0A patent/CN103580712B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101395808A (en) * | 2006-05-19 | 2009-03-25 | 株式会社村田制作所 | Matching device, and antenna matching circuit |
| CN101308955A (en) * | 2008-05-22 | 2008-11-19 | 杭州中科微电子有限公司 | Radio frequency integrated GPS active antenna |
| US20110143685A1 (en) * | 2009-12-10 | 2011-06-16 | Haki Cebi | Multiband Low Noise Amplifier (LNA) With Parallel Resonant Feedback |
| WO2012064665A2 (en) * | 2010-11-08 | 2012-05-18 | Paratek Microwave, Inc. | Method and appartus for tuning antennas in a communication device |
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| CN103580712B (en) | 2015-07-15 |
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